mirror of https://github.com/JakubMelka/PDF4QT.git
152 lines
3.6 KiB
C++
152 lines
3.6 KiB
C++
// Copyright (C) 2020-2021 Jakub Melka
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//
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// This file is part of PDF4QT.
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//
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// PDF4QT is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// with the written consent of the copyright owner, any later version.
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//
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// PDF4QT is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with PDF4QT. If not, see <https://www.gnu.org/licenses/>.
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#include "pdfexecutionpolicy.h"
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#include <QThread>
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#include <QApplication>
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namespace pdf
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{
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struct PDFExecutionPolicyHolder
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{
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PDFExecutionPolicyHolder()
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{
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qAddPostRoutine(&PDFExecutionPolicy::finalize);
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}
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~PDFExecutionPolicyHolder()
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{
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auxiliary.waitForDone();
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primary.waitForDone();
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}
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PDFExecutionPolicy policy;
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QThreadPool primary;
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QThreadPool auxiliary;
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} s_execution_policy;
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void PDFExecutionPolicy::setStrategy(Strategy strategy)
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{
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s_execution_policy.policy.m_strategy.store(strategy, std::memory_order_relaxed);
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}
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bool PDFExecutionPolicy::isParallelizing(Scope scope)
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{
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const Strategy strategy = s_execution_policy.policy.m_strategy.load(std::memory_order_relaxed);
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switch (strategy)
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{
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case Strategy::SingleThreaded:
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return false;
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case Strategy::PageMultithreaded:
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{
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switch (scope)
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{
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case Scope::Page:
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case Scope::Unknown:
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return true; // We are parallelizing pages...
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case Scope::Content:
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return false;
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}
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break;
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}
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case Strategy::AlwaysMultithreaded:
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return true;
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}
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// It should never go here...
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Q_ASSERT(false);
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return false;
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}
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int PDFExecutionPolicy::getActiveThreadCount(Scope scope)
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{
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return getThreadPool(scope)->activeThreadCount();
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}
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int PDFExecutionPolicy::getMaxThreadCount(Scope scope)
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{
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return getThreadPool(scope)->maxThreadCount();
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}
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void PDFExecutionPolicy::setMaxThreadCount(Scope scope, int count)
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{
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// Sanitize value!
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count = qMax(count, 1);
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getThreadPool(scope)->setMaxThreadCount(count);
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}
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int PDFExecutionPolicy::getIdealThreadCount(Scope scope)
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{
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Q_UNUSED(scope);
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return QThread::idealThreadCount();
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}
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int PDFExecutionPolicy::getContentStreamCount()
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{
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return s_execution_policy.policy.m_contentStreamsCount.load(std::memory_order_relaxed);
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}
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void PDFExecutionPolicy::startProcessingContentStream()
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{
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++s_execution_policy.policy.m_contentStreamsCount;
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}
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void PDFExecutionPolicy::endProcessingContentStream()
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{
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--s_execution_policy.policy.m_contentStreamsCount;
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}
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void PDFExecutionPolicy::finalize()
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{
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s_execution_policy.auxiliary.waitForDone();
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s_execution_policy.primary.waitForDone();
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}
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QThreadPool* PDFExecutionPolicy::getThreadPool(PDFExecutionPolicy::Scope scope)
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{
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switch (scope)
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{
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case Scope::Page:
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case Scope::Unknown:
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return &s_execution_policy.primary;
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case Scope::Content:
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return &s_execution_policy.auxiliary;
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default:
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Q_ASSERT(false);
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break;
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}
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return nullptr;
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}
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PDFExecutionPolicy::PDFExecutionPolicy() :
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m_contentStreamsCount(0),
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m_strategy(Strategy::PageMultithreaded)
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{
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}
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} // namespace pdf
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